As a hot wind shifted north and drove the flames toward Onyx Peak east of Big Bear Lake, fire crews deployed to save homes scattered among brittle-dry pines — waiting for help from a DC-10 laden with 10,800 gallons of retardant.

It never came. Shortly before 6 p.m. on Wednesday, an incident commander on the ground spotted a hobby drone buzzing near the drop site at 11,000 feet. The air tanker had to turn back, as did two smaller planes following it.

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Officials fighting the Lake fire in the San Bernardino Mountains scrambled to warn the public that it is illegal and dangerous to fly drones in restricted airspace around a fire. Unmanned aircraft are particularly hazardous because authorities have no idea who is controlling them or how they might maneuver.

The DC-10 had to divert and drop its retardant on a fire along the Nevada border, while the two smaller planes had to jettison theirs because they couldn't land with that much weight. Officials said the failed mission cost between $10,000 and $15,000.

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